const hexcase = 0;
const b64pad = '';
const chrsz = 8;

function safeAdd(x, y) {
  const lsw = (x & 0xffff) + (y & 0xffff);
  const msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xffff);
}

function bitRol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt));
}

function md5Cmn(q, a, b, x, s, t) {
  return safeAdd(bitRol(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b);
}

function md5FF(a, b, c, d, x, s, t) {
  return md5Cmn((b & c) | (~b & d), a, b, x, s, t);
}
function md5GG(a, b, c, d, x, s, t) {
  return md5Cmn((b & d) | (c & ~d), a, b, x, s, t);
}
function md5HH(a, b, c, d, x, s, t) {
  return md5Cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5II(a, b, c, d, x, s, t) {
  return md5Cmn(c ^ (b | ~d), a, b, x, s, t);
}

function str2binl(str) {
  const bin = [];
  const mask = (1 << chrsz) - 1;
  for (let i = 0; i < str.length * chrsz; i += chrsz)
    bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << i % 32;
  return bin;
}

function coreMd5(xx, len) {
  const x = xx;
  x[len >> 5] |= 0x80 << len % 32;
  x[(((len + 64) >>> 9) << 4) + 14] = len;
  let a = 1732584193;
  let b = -271733879;
  let c = -1732584194;
  let d = 271733878;
  for (let i = 0; i < x.length; i += 16) {
    const olda = a;
    const oldb = b;
    const oldc = c;
    const oldd = d;

    a = md5FF(a, b, c, d, x[i], 7, -680876936);
    d = md5FF(d, a, b, c, x[i + 1], 12, -389564586);
    c = md5FF(c, d, a, b, x[i + 2], 17, 606105819);
    b = md5FF(b, c, d, a, x[i + 3], 22, -1044525330);
    a = md5FF(a, b, c, d, x[i + 4], 7, -176418897);
    d = md5FF(d, a, b, c, x[i + 5], 12, 1200080426);
    c = md5FF(c, d, a, b, x[i + 6], 17, -1473231341);
    b = md5FF(b, c, d, a, x[i + 7], 22, -45705983);
    a = md5FF(a, b, c, d, x[i + 8], 7, 1770035416);
    d = md5FF(d, a, b, c, x[i + 9], 12, -1958414417);
    c = md5FF(c, d, a, b, x[i + 10], 17, -42063);
    b = md5FF(b, c, d, a, x[i + 11], 22, -1990404162);
    a = md5FF(a, b, c, d, x[i + 12], 7, 1804603682);
    d = md5FF(d, a, b, c, x[i + 13], 12, -40341101);
    c = md5FF(c, d, a, b, x[i + 14], 17, -1502002290);
    b = md5FF(b, c, d, a, x[i + 15], 22, 1236535329);
    a = md5GG(a, b, c, d, x[i + 1], 5, -165796510);
    d = md5GG(d, a, b, c, x[i + 6], 9, -1069501632);
    c = md5GG(c, d, a, b, x[i + 11], 14, 643717713);
    b = md5GG(b, c, d, a, x[i], 20, -373897302);
    a = md5GG(a, b, c, d, x[i + 5], 5, -701558691);
    d = md5GG(d, a, b, c, x[i + 10], 9, 38016083);
    c = md5GG(c, d, a, b, x[i + 15], 14, -660478335);
    b = md5GG(b, c, d, a, x[i + 4], 20, -405537848);
    a = md5GG(a, b, c, d, x[i + 9], 5, 568446438);
    d = md5GG(d, a, b, c, x[i + 14], 9, -1019803690);
    c = md5GG(c, d, a, b, x[i + 3], 14, -187363961);
    b = md5GG(b, c, d, a, x[i + 8], 20, 1163531501);
    a = md5GG(a, b, c, d, x[i + 13], 5, -1444681467);
    d = md5GG(d, a, b, c, x[i + 2], 9, -51403784);
    c = md5GG(c, d, a, b, x[i + 7], 14, 1735328473);
    b = md5GG(b, c, d, a, x[i + 12], 20, -1926607734);
    a = md5HH(a, b, c, d, x[i + 5], 4, -378558);
    d = md5HH(d, a, b, c, x[i + 8], 11, -2022574463);
    c = md5HH(c, d, a, b, x[i + 11], 16, 1839030562);
    b = md5HH(b, c, d, a, x[i + 14], 23, -35309556);
    a = md5HH(a, b, c, d, x[i + 1], 4, -1530992060);
    d = md5HH(d, a, b, c, x[i + 4], 11, 1272893353);
    c = md5HH(c, d, a, b, x[i + 7], 16, -155497632);
    b = md5HH(b, c, d, a, x[i + 10], 23, -1094730640);
    a = md5HH(a, b, c, d, x[i + 13], 4, 681279174);
    d = md5HH(d, a, b, c, x[i], 11, -358537222);
    c = md5HH(c, d, a, b, x[i + 3], 16, -722521979);
    b = md5HH(b, c, d, a, x[i + 6], 23, 76029189);
    a = md5HH(a, b, c, d, x[i + 9], 4, -640364487);
    d = md5HH(d, a, b, c, x[i + 12], 11, -421815835);
    c = md5HH(c, d, a, b, x[i + 15], 16, 530742520);
    b = md5HH(b, c, d, a, x[i + 2], 23, -995338651);
    a = md5II(a, b, c, d, x[i], 6, -198630844);
    d = md5II(d, a, b, c, x[i + 7], 10, 1126891415);
    c = md5II(c, d, a, b, x[i + 14], 15, -1416354905);
    b = md5II(b, c, d, a, x[i + 5], 21, -57434055);
    a = md5II(a, b, c, d, x[i + 12], 6, 1700485571);
    d = md5II(d, a, b, c, x[i + 3], 10, -1894986606);
    c = md5II(c, d, a, b, x[i + 10], 15, -1051523);
    b = md5II(b, c, d, a, x[i + 1], 21, -2054922799);
    a = md5II(a, b, c, d, x[i + 8], 6, 1873313359);
    d = md5II(d, a, b, c, x[i + 15], 10, -30611744);
    c = md5II(c, d, a, b, x[i + 6], 15, -1560198380);
    b = md5II(b, c, d, a, x[i + 13], 21, 1309151649);
    a = md5II(a, b, c, d, x[i + 4], 6, -145523070);
    d = md5II(d, a, b, c, x[i + 11], 10, -1120210379);
    c = md5II(c, d, a, b, x[i + 2], 15, 718787259);
    b = md5II(b, c, d, a, x[i + 9], 21, -343485551);

    a = safeAdd(a, olda);
    b = safeAdd(b, oldb);
    c = safeAdd(c, oldc);
    d = safeAdd(d, oldd);
  }
  return [a, b, c, d];
}

function coreHmacMd5(key, data) {
  let bkey = str2binl(key);
  if (bkey.length > 16) bkey = coreMd5(bkey, key.length * chrsz);

  const ipad = [];
  const opad = [];
  for (let i = 0; i < 16; i += 1) {
    ipad.push(bkey[i] ^ 0x36363636);
    opad.push(bkey[i] ^ 0x5c5c5c5c);
  }

  const hash = coreMd5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
  return coreMd5(opad.concat(hash), 512 + 128);
}

function binl2hex(binarray) {
  const hexTab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef';
  let str = '';
  for (let i = 0; i < binarray.length * 4; i += 1) {
    str +=
      hexTab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xf) +
      hexTab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xf);
  }
  return str;
}

function binl2b64(binarray) {
  const tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  let str = '';
  for (let i = 0; i < binarray.length * 4; i += 3) {
    const triplet =
      (((binarray[i >> 2] >> (8 * (i % 4))) & 0xff) << 16) |
      (((binarray[(i + 1) >> 2] >> (8 * ((i + 1) % 4))) & 0xff) << 8) |
      ((binarray[(i + 2) >> 2] >> (8 * ((i + 2) % 4))) & 0xff);
    for (let j = 0; j < 4; j += 1) {
      if (i * 8 + j * 6 > binarray.length * 32) str += b64pad;
      else str += tab.charAt((triplet >> (6 * (3 - j))) & 0x3f);
    }
  }
  return str;
}

function hexMd5(s) {
  return binl2hex(coreMd5(str2binl(s), s.length * chrsz));
}
function b64Md5(s) {
  return binl2b64(coreMd5(str2binl(s), s.length * chrsz));
}
function hexHmacMd5(key, data) {
  return binl2hex(coreHmacMd5(key, data));
}
function b64HmacMd5(key, data) {
  return binl2b64(coreHmacMd5(key, data));
}
function calcMD5(s) {
  return binl2hex(coreMd5(str2binl(s), s.length * chrsz));
}

function md5VmTest() {
  return hexMd5('abc') === '900150983cd24fb0d6963f7d28e17f72';
}

const md5 = {
  md5(str) {
    return hexMd5(str);
  },
};
export default md5;
